碰撞效应对非规则梁桥横向地震反应的影响  

Influence of pounding effects on transverse seismic response of a nonstandard girder bridge

作　　者：徐略勤[1] 李建中[1] 吴陶晶[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《振动与冲击》2011年第4期95-99,123,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(90815007)

摘　　要：通过考虑上部梁体与防震挡块间的横向碰撞效应,采用线性和非线性时程分析法对非规则梁桥横向地震力的分布规律进行了对比研究。研究表明:板式橡胶支座的采用有利于减轻由于墩高不一致带来的非规则梁桥横向剪力分布不均的困扰,但同时增加了主梁与挡块间横向碰撞的机率;碰撞效应的考虑不仅使桥梁结构动力响应增大,而且造成各墩受力重新趋于不均。最后通过参数分析,探讨了不同碰撞条件下非规则梁桥横向地震力分布的变化规律,得到了有益的结论。Taking pounding effects between girders and retainers into account,a comparative study on the distribution of transverse seismic force among piers was conducted using linear and nonlinear time history analysis methods.The results showed that,by utilizing rubber bearings,it is effective to distribute the transverse seismic force uniformly to the piers;but in the mean time,the possibility of the pounding between girders and retainers comes into reality;it is found that pounding effects will not only amplify the dynamic response of a bridge,but also make the distribution of transverse seismic force uneven among the piers.Based on the results of parametric analysis,some constructive conclusions on variation laws of the transverse seismic force distribution under different pounding conditions were made.

关 键 词：碰撞效应 地震力分布 对比研究 参数分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]